Tandem mandrel



J. SUNNEN TANDEM MANDREL Dec. 25, 1951 Filed Feb. 15, 1949 Patented Dec. 25, 1951 UNITED STATES PATENT OFFICE 1' 2,580,327 1 1 I I I I 7 Q TANDEM Manhunt Joseph Sunnen, Clayton, Mo.- Application Februar 15, 1949, Serial No. 76,593

1 'i This invention relates to improvements in the construction of a honing arbor or mandrel of the tandem type such as may be utilized in a honing machine of the character illustrated in my previous Patent No. 2,377,588, patented June 5, 1945.

One of the objects of the present invention is to provide a mandrel structure in which the diametrically arranged sets of hones'are positioned in tandem with respect to the cylindrical mandrel body, the hone elements being constructed and arranged for association with axially operable adjusting means.

Another object of the invention is to provide an elongated mandrel body. having adjustable hones arranged in tandem and subject to relative individual pre-setting and simultaneous automatic adjustment through the medium of mechanism provided by the honing machine and associated with the wedge bars carried by the mandrel.

A still further object of theinvention is to provide a honing mandrel with'an axial bore for the reception and movement of the actuating wedge bars, the wedge bars for each set of honing elements being associated together'b a oneway connection to furnish simultaneous adjust ment from the machine control mechanism but permitting individual pre-setting to furnish relative arrangement between the hone sets as may be required by the nature of the work to be accomplished by the assembly.

More specifically the present invention comprehends a mandrel structure including an elongated tubular mandrel body, the bore of which is generally of'rectangular form to provide for the seating and movement of the wedge bar mechanism and the body is further formed with spaced transverse openings formed in tandem relationship to accommodate the hones to be actuated by the wedge bars, the wedge bars for each tandem set of mandrels being operably'connected by a one-way connection, and one set of wedge bars being shiftable manually with respect to the other set so that the hones may be initially relatively positioned in accordance with the requirements. 7

Other features of this invention will more clearly hereinafter appear by reference to the accompanying drawings and specification wherein like characters of reference designate corresponding parts throughout the several views, in which: I Fig. 1 is a longitudinal vertical section through one former mandrel structure showing'the wedge 8 Claims. (Cl. fil -184.3)

bars and associated operating mechanism in elevation;

Fig. 2 is a'fragmentary longitudinal horizontal section through the first hone area of the tandem assembly;

Fig. 3 is an end elevation;

Fig. 4 is a transverse section on line 4-5 of Fig. 1;

Fig. 5'is a transverse section on line 5-5 of Fig. 1;

Fig. 6 is a longitudinal vertical section of a modified form of my invention;

Fig. 7 is a top plan view of the mandrel with y parts broken away in section;

Fig. 8 is'a transverse section through the mandrel at line 88 of Fig. 6;

Fig. 9 is a transverse section through the mandrel of Fig.0 taken on line 9-9;

Fig. 10 is a transverse section of the mandrel of Fig. 6 taken on lme lu-l Ii Fig. 11 15a detail showing the connecting disc at the outer extremity of the outer wedge elements; and

Fig. 12 is a detail showing the outer extremity of the wedge elements.

.portion I which is adapted to be chucked in a machine of the type of my prior Patent No. 2,070,361 and the cylindrical body portion 2, the latter being enlarged in diameter at spaced points as at 3 to a diameter which will facilitate the use of radially adjustable hones as will be more fully hereinafter described. The mandrel bodies in both the forms of Figs. 1 and 6 are generally the same insoiar as the previously mentioned parts are concerned, the heads I which are chucked in the honing machine being formed in each instance with an enlarged initial bore 5, the wall of which is notched at 6, and the bore l, the latter extending throughout the elongated cylindrical mandrel body, as shown in the drawings, to facilitate convenient arrangement, assembly, and manipulation of the parts.

In the form of the invention shown in Fig. 1, the cylindrical mandrel body is shown as formed in sections, however, this sectional structure is provided purely for the matter of convenience and does not in any way alter the nature of the invention. As illustrated, the mandrel body is formed with enlarged hone holding parts machined separately from the main body portions, the enlarged parts being indicated by reference character 3 and having reduced end portions 8 and 8 which are received within the adjacent cylinder sections and secured therein either by screw threads as shown at 9 or by a suitable drive fit as at It. Considering the mandrel body as a unit and regardless of its sectional nature in the present illustration, this body will be seen to have an end to end axial bore II, this bore being of general rectangular form and of such dimension as to snugly receive the fore and aft spaced wedges for operating two sets of hone assemblies as best shown in Figs. 4 and 5. For the purpose of convenience, the set of wedges I2 will be referred to as the inner wedges, While the wedges I4 will be indicated as the outer set of wedges, these inner and outer sets of wedges being obviously for the operation of the twosets of tandem hone elements.

Referring to Fig. 2 it will be seen that one wedge of the inner set of wedges is formed with an elongated shank I5 terminating in an offset hooked extremity I6 for-cooperation with the operating mechanism or the honing machine, the elongated portion I5 extending into the enlarged initial'bore 5 formed in the head 'I 'of the'inandr'el structure. The companion wedge of the wedge set I2 is merely of such length as to extend properly beyond each "end of the transverse hone recess IT 'a Sufficient distance to "permit the movement of the wedges I2 to procure the necessary adjustment ofthe hones, it being apparent that the area of the transverse hone reoess'is necessarily substantially widened beyond the diameter of the axial bore 'to permit insertion, removaLand adjustment of "the hones which cooperate with the wedges IL "The two wedges I'2 of the inner set of wedges are spaced apart in parallel relation throughout their length, being held in fixed relation atth'eir inner ends by the spacing rivet I8 and at their outerends by the rivet I9,the latter'forining a'pivot for the connecting rod which extends forwardly "and axially through the bore of the 'ma'ndrel. The end'portion 2| 'of the connecting rod'20 is of such diameter as to retain the parallel wedges l2 in their proper positions and against the adjacent fiat side walls of the bore inthe mandrel body, and this end portion is "formed with a transverse opening'w'hi'ch receivesthepin or rivet I9 in a'manner topermit relative'rnovementbetween theconnecting'rodn and'the wedges 12. The inner ends of'thewedgesl2 areheld in dose abutting relation against the adjacent flat faces 22 of the mandrel and these wedges I2 are of such dimension as to permit their sliding movement under operation of the 'adjustingmechanism'of the honingmachine, without permitting unnecessary and undesirable play either vertically or laterally as will be seen by reference "to Fig. '5, in which figure the contacting surface is exaggerated at 22 and the bodies of the hone carrying elements are shown as being'flush across both the'transvers'eand longitudinal walls of the wedges and'like'wise flush against the spaced parallelsides 23of the transverse mandrel "slotin which they are arranged.

The first or inner set of hone elements are best shown in cross'section in Fig.5, each of the twohones'of the set beingof identical form and including a body having outwardly faced angular faces "3| and 32 to which are secured 34, which latter'isformed with hat inner and outer parallel faces, the outer face '35 snugly engaging the adjacent 'wall of the transverse hone 'slot' and the inner iace 3fi" abutting against the hone elements 33 and the side leg portion 4 and lying flush with the outer face of the wedges I2. Each of the hones are of identical form with the ends of the legs 34 abutting the inner face 31 of the head 30 of the companion hone element. The transverse dimensions of the legs 34 of the hones are substantially identical with the transverse dimensions of the wedges I2 so that the wedges will fit snugly at both their outer sides and ends against the associated bones to retain these hone members against shifting or vibrating at any time. I he vibration of the hone and wedge assembly is prevented by providing dimensions for the wedges and hones so that the walls 35 confine the parts against any lateral movementbut permit necessary relative sliding movement to provide for adjustments.

It is essential in a tandem hone assembly that the inner and outer hone assemblies be so constructed and arranged that they may be adjusted or pre-set with respect to each other previous to a honing operation andto accomplish this purpose the rod 20 which is connected to the inner wedges I2 projects through the axial bore in the cylindrical hone body to a point adjacent its outer end where it is slightly reduced in diameter as at 40 and threaded at its outer reduced end as shown at M to receive the nut 42. ,A washer 43 is provided at the inner face of the nut 42 to coa'ct with the adjacent wedge ends as will more clearly hereinafter appear. It will be noted that the outer hones 45, shown in Fig. 4, travel in the transverse outer hone slot'defined by walls 46 and are held against longitudinal movement by abutting the end walls of this transverse hone slot. These outer bones are operated by the outer companion wedge elements 59 which are received and travel within the rectangular bore of the mandrel body at its outer end portion. The inner faces of the wedges are grooved or recessed longitudinally and medially at 5i to receive and guide the rod 20, the association of the rod 20 and the wedges 50 being such that these wedges are held in compact association with the outer hones 45 in the same manner and under the same conditions as described in connection with the inner hones 30 and inner wedges I2. A coiled spring 55 .is arranged on the rod 28 and interposed between the wedges I2 and the wedges 50, the springs having at their ends the stops '58 and 51 which abut against the inner ends of the wedges 50 and against the head portion 25 of the.

rod 20. The spring 55 normally positions the outer wedges I4 with respect to the inner wedges I2 and maintain these outer wedges in a predetermined position as defined by the initial adjustment produced by the rotation of the thumb screw 42 on the outer threaded end portion of the rod '20. Due to the structure heretofore set forth the rotation of the nut 42 will urge the rod 20 outwardly against the tension of the spring 55, thus shifting the inner pair of wedges with respect to the outer pair of wedges and consequently varying'the inner set of hones with respect to the outer set of hones by urging them radially due to'movement of the angular wedge faces.

and'the wedges 50 in the same direction and'to the same extent, as the rod 20 being connected to the wedges I2 will be retracted with these wedges and due to the enlarged nut 42 simultaneously "moveithewedgesifl against tension of head structure of the mandrel is substantially the same as the head structure in the modification shown in Fig. 1, while the tubular body of the mandrel is formed as an integral structure to include the spaced enlarged transversely slotted hone carrying portions 3. Also in this modifica tion the outer end portion of ther mandrel 50.

projects forwardly a greater distance'beyond the outer enlarged section .3 than in the first modi fication to provide in the end portionof the'bore an enlarged chamber 6| to receive the actuating spring 62. The function of the spring 62 i's'identical with the function of the spring 55 and performs the same function. The arrangement of the operating wedges l2 and 50 and their association with the tandem hones corresponds to the first modificatiomhowever, the wedges themselves are slightly modified. In the form ofFig. 6, the wedges i2 are slightly modified by offsetting the inner shank portions 63 inwardly for a substantial portion of their lengthto causethe'm to abut ina plane at substantially the axis'of the structure where they are riveted and'hooked together, the rivet being shown at 64, while the. hooked engagement is indicated at 65, this structure providing a more rigid assembly ofthese parts. The'outer' ends of the inner wedges and their connection with the draw bar 20 is substantially identical in both modifications, except for the omission of the stops for the spring, which latter is not positioned intermediate the wedges but in the end socket 6| as heretofore mentioned. By virtue of the fact that the spring is at the end of the assembly in the socket 6|, it is necessary that the outer wedges 50 be slightly modified and this is accomplished by providing these wedges 50 with inwardly spaced notches 66 which provide the terminal hook 61, the latter being adapted to engage the projection 68 formed by the irregular wall structure defining the opening 69 in the washer 10 at the end of the spring recess. 6|. is moved through, the enlarged opening 69 as in-, dicated at H and is then moved laterally so that the notches 66 receive the projecting wall por-' tions 68. This obviously frees the widened passageway H to permit the insertion of the second wedge and its lateral movement and its engagement with the opposite pair of shoulders 68,- properly spacing the-wedges 50 for the reception of the connecting rod 20 which seats in the longitudinal recesses as in the first modification. Thus assembled the parts are locked together and the wedges 50 of the second modification can be shifted by rotation of the nut 42 on the threaded extremity 41 of the rod 20, the nut moving along the rod against the washer 12 which abuts the outer ends of the wedges 50 and moves them axially of the assembly against the tension of the spring 62. This shifting of the wedges 50 will position the outer hone assembly with respect to the inner hone assembly to procure any desired initial adjustment.

The shape and construction of the wedges, including the angular wedge grooves 13 and the angularly disposed lugs 74 on the hones, do not particularly form a part of the present invention In assembly an individual wedge 50 j substantially identical, however, the nature of and are not illustrated in detail, other than to show the desired arrangement for the present installation, with the wedge grooves facing outwardly of the wedge members and the hone lugs facing inwardly and aligned to cooperate with the grooves.

In both forms of the invention a cylindrical arbor structure is.utilized, havingtheenlarged chucking end for association with the mechanism. The arbor structure in both modifications is formed with an axial bore of general rectangular cross section to receive the longitudinally spaced wedges which actuate the two sets of hones which are arranged in tandem in spaced transverse slotsiformed through the arbor body.

Obviously, these spaced transverse slots for receiving the hone elements piercethe body of the arbor medially-to properly intersect the axial bore. The hone assemblies and the association of the hone assemblies in both modifications is the honing element per se can be modified according to requirements as determined by the particular operation. In the modification of Fig.

6 the honing elements are shown as different" from those of the modification of Fig. 1. It will be noted in the latter modification that removable guide plates are provided at 4, however, the use of such guide elements may be a matter of choice in order to better" stabilize the assembly during certain operations and while using certain types of hones.

In the present disclosures only two sets of hones are provided, these sets of hones being arranged in tandem and capable of selective and/ or simultaneous adjustment. The'arrangement of tandem hones permits the use of the tool in working on tandem axial bores, and the inventive thought involved in the development can be modified to the extent of associating with an arbor any additional sets of hones likewise associated for operating on a third or in fact any number of axially aligned bores which are to be honed. A multiple of the instant structures could be associated with hones of greater or lesser length and with'clifierent spacing between the hone sets. In the modification of Fig. 1, in

which the mandrel is made in sections, it will be apparent that the longitudinal relationship of the sets of hones could readilybe provided by substituting and interchangin the sections of the mandrel to utilize parts of different length and the joints between thesectional parts of the mandrel could be connected by screw threads or other separable means to facilitate the operation. Obviously the wedge structure, in instances where the longitudinal arrangement of the hone sets is varied, should also be varied to properly associate the wedges with the tandem sets of hones. In utilizing a tandem honeit will be understood that the guide shoes which are illustrated may be arranged as required and may be only associated with certain pre-determined hone assemblies to provide the necessary structure for accomplishing accurate work on the wall of the bore which is being honed.

What I claim is:

1. In a honing mandrel assembly, a body formed with an axial bore, an adjusting mechanism for hones arranged in said bore, said body having spaced openings extending transversely therethrough and intersecting said bore for receiving a plurality of expansible hone carrying elements to be operably associated with said adjusting mechanism, said adjusting mechanism including .a rod member, wedges longitudinally connected to said rod member and engaging said hone carrying elements, means for securing .cer.- tain of said wedges to said rod and against Ion.- gitudinal movement in either direction with respect to said rod, means for connecting others of said wedges on said rod for longitudinal movement in one direction only, and means for shiit ing the last named wedges with respect to said rod and with relation to the fixed wedges, in cluding a member threaded .on said rod and a spring for urging said last-named wedges toward said threaded member.

2. In a honing mandrel assembly, a body formed with an axial bore, an adjusting mechanism for hones arranged in said bore, said body having spaced openings extending transversely therethrough and intersecting said vbore for receiving a plurality of expansible hone carrying elements to be operably associated with said adjusting mechanism, said adjusting mechanism including a rod positioned in said axial bore, Wedge bars spaced longitudinally in said bore, certain of said Wedge bars'being pivot-ally associated with one extremity of said rod, other of said wedgesbeing arranged iorsliding movement on said bar, spring means for normally urging said sliding wedges in one direction, and .means threaded on said rod to adj st said sliding wedges against said spring means 3. The structure of claim 2 characterized .in that the wedges pivoted at the end of the bar are arranged in parallel relation and have their outer ends rigidly secured together.

4. A honing mandrel including a body formed with an axial bore, said body having spaced transversely extending openings formed therethrough and intersecting said bore, spaced sets of hone carrying elementsarranged in said openings, adjusting mechanism for said hone carrying elements slidably-arranged in said bore, said adjusting mechanism including spaced sets of wedges engaging said hone carrying elements to move the same laterally of the axis of the bore, a rod hinged to the inner end portionof the first set of wedges and extending axially of the here between the second set of wedges, said second set of wedges being slidably arranged with relation to said rod, a spring normally urging the second set of wedges longitudinally of .the rod, a member slidable on the end portion of said rod and coupled to the second set of wedes, and a threaded member on the ,rod abutting said slidable member for adjusting said wedges against the tension of said spring.

5. The structure of claim .4 characterized in that the second set of wedges are united at their outer extremities by anelement forming a stop for one end of said spring.

6. In a honing mandrel assembly, a body 8 formed with an axial bore, an adjusting mecha nism for hones arranged in said bore, said body having longitudinally spaced openings extending transversely therethrough and intersecting said bore for receiving a plurality of -xpansible hone carrying elements to be operabl-yassociated with said adjusting mechanism, said adjusting mechanism including a rod member, spaced wedges hingedly connected with said rod member, means for securing certain of said wedges to said rod and against longitudinal movement in either direction with respect to said rod, means I for connecting othersof said wedges on'said rod for longitudinal movement in one directiononly, and means carried by said rod for shifting the last named wedges with respect to said rod and withre ai to the and w d es 7,- In a m n re assem ly, a bpd rmed wi h an a a b r sa bo .lla i e lon ud nally ce r v e o ening ext din h r o e a i t t sai b re a lu ali of t of ans bl h n' carryin e ement .51 an i s id eninsa a usti m an f sale hone carrying elements axially arranged in said bore and including sets of wedges normally en'- gaging said hone carrying elements, a rod ele-' m u e t nd mov e wi on s t 9 wedges and extending axially through said bore and between a second set of wedge elements for relative sliding movement th iewith. ,3 stop element axially movable alon said rod and con nected with the second set for" wedge elements to shift the same axially along said rod, and a spring member within said bore resiliently urging Said se o s of W e leme ts again said stop member, whereby the second set of wedge elements may be shifted axially of the rod independent of the first set ,of 110118 carrying elements. 7

-8. The structure of claim '7 characterized in that the stop element includes a nut axially threaded on the outer end portion of the rod.

JOSEPH SUNNEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES RAIE IS' Date 

